The Boroughs first ever Mayor’s show was held on 27th May 1966 and was organised by Portadown junior chamber of commerce. The Chief emphasis of the event was to showcase Portadown’s Industrial capacity. The show featured a procession of decorated floats, with local bands and organisations including youth organisations taking part.
Portadown Mayor at the time was Collr. R.J. Williamson. An award for the best float on display was up for grabs, although this was not an easy win, as the competition was open to all of Co.Armagh. It was described as the best event of its kind outside of Belfast. The Chairman of the organising committee was Mr Bob Raj.